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NEES-Pile: Experimental and Computational Study of Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading COMPARISON BETWEEN CENTRIFUGE AND.

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Presentation on theme: "NEES-Pile: Experimental and Computational Study of Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading COMPARISON BETWEEN CENTRIFUGE AND."— Presentation transcript:

1 NEES-Pile: Experimental and Computational Study of Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading COMPARISON BETWEEN CENTRIFUGE AND REAL SCALE MODEL TESTS: LG0 - SG1 By Student: Marcelo Gonzalez Professor: Tarek Abdoun Rensselaer Polytechnic Institute August 20 th, 2007

2 Table of Contents BUFFALO REAL SCALE Water, 1 cp K= 1E-2 cm/sec DR = 55% TABLE OF CONTENTS: 1.SIMULATION OF LG0 1.1Model configuration, soil properties, Instrumentation and centrifuge model preparation. 1.2Input acceleration. 1.3Time History responses. 1.4Stress – Strain responses. 2.SIMULATION OF LG0 2.1Model configuration, soil properties, Instrumentation and centrifuge model preparation. 2.2Input acceleration. 2.3Time History responses and profiles of the data. 2.4Stress – Strain responses. 3.DISCUSSION

3 SIMULATION LG0 BUFFALO REAL SCALE Water, 1 cp K= 1E-2 cm/sec DR = 55% SIMULATION OF LG0

4 Soil Properties and Instrumentation LG0 D 50 = mm D 10 = mm FC = 0.1% e min = e max = Gs = K = 1 x cm/sec, 40%DR (Gonzalez M., 2006)

5 Model Configuration LG0 Pore Pressure LVDT Accelerometer X Accelerometer Y 0 cm 21.5 cm (5.38 m) 19 cm (4.75 m) 14 cm (3.50 m) 6.0 cm (1.50 m) Left Right 7.5 cm (1.88 m) High Speed Camera

6 Model Preparation LG0 BUFFALO REAL SCALE sand Latex Membrane acelerometer Dry sand pluviation method Ottawa sand Outer chamber (vacuum = 100 kPa) Outer (100 kPa) Latex Membrane acelerometer Model Saturation System Ottawa sand Chamber Vacuum Inner (90 kPa)

7 Results: Input Acceleration LG0 INPUT ACCELERATION TIME CONSIDERED IN THE ANALISIS

8 Results: Acceleration in the rings LG0 INPUT ACCELERATION ACR5 ACR4 ACR3 ACR2 ACR1

9 Results: Acceleration in the soil LG0 INPUT ACCELERATION ACCR5 ACCR4 ACCR3 ACCR2 ACCR1

10 Results: Excess Pore Water Pressure LG0 INPUT ACCELERATION PWC5,PWU3 PWC4, PWD2 PWC3, PWU2 PWC2, PWD1 PWC1, PWU1

11 Results: Excess Pore Water Pressure Dissipation LG0 INPUT ACCELERATION PWC5,PWU3 PWC4, PWD2 PWC3, PWU2 PWC2, PWD1 PWC1, PWU1

12 Results: Lateral Displacement in the soil LG0 INPUT ACCELERATION LVR5 LVR4 LVR3 LVR2 LVR1

13 Results: Stress – Strain Loops LG0 0-12sec GSI 1.0 Strain – Stress Loops Calculated by considering Soil Accelerometers and Inertia of the ring correction

14 Results: Shear Wave Velocity LG0 Centrifuge University of Buffalo No ring inertia effect No degradation effect No ring inertia effect No degradation effect A. Elmekati, 2007

15 SIMULATION SG1 SIMULATION OF SG1

16 Results: Strain – Stress Loops LG0 The same configuration and preparation method than LG0 was used to create SG1. The only difference was the inclination angle. Model inclination angle = 2 degrees Prototype inclination angle = 5 degrees

17 Results: Input Acceleration SG1

18 Results: Acceleration in the rings SG1 2.25m, ACR4 5.38m, ACR1 4.75m, ACR2 3.50m, ACR3 1.50m, ACR5 INPUT ACCELERATION

19 Results: Acceleration in the soil SG1 2.25m, ACCR4 5.38m, ACCR1 4.75m, ACCR2 3.50m, ACCR3 1.50m, ACCR5 INPUT ACCELERATION

20 Results: Excess Pore Water Pressure SG1 2.25m, PWC4 5.38m, PWC1 4.75m, PWC2 3.50m, PWC3 1.50m, PWC5 INPUT ACCELERATION

21 Results: Lateral Displacement in the soil SG1 2.25m, LVR4 5.38m, LVR1 4.75m, LVR2 3.50m, LVR3 1.50m, LVR5 INPUT ACCELERATION

22 Results: Lateral Displacement in the soil SG1 2.25m, LVR4 5.38m, LVR1 4.75m, LVR2 3.50m, LVR3 1.50m, LVR5 INPUT ACCELERATION Event1 (E1): Between 5.30 and 5.6 sec Event2 (E2): Between 5.75 and 6.0 sec Event3 (E3): Between 6.20 and 7.3 sec Event4 (E4): Between 25.0 and 30.0 sec E1 E2 E3

23 Results: Lateral Displacement in the soil SG1 2.25m, LVR4 5.38m, LVR1 4.75m, LVR2 3.50m, LVR3 1.50m, LVR5 INPUT ACCELERATION Event1 (E1): Between 5.30 and 5.6 sec Event2 (E2): Between 5.75 and 6.0 sec Event3 (E3): Between 6.20 and 7.3 sec Event4 (E4): Between 25.0 and 30.0 sec E4

24 Results: Lateral Displacement in the soil SG1

25 4sec5.5sec 6sec27sec

26 Results: Stress – Strain Loops SG1 GSI 1.0 Strain – Stress Loops Calculated by considering Soil Accelerometers and Inertia of the ring correction SAA NO RING CORRECTION

27 Results: Shear Wave Velocity SG1 centrifuge University of Buffalo A.Elmekati, 2007

28 Discusion SG1 Thank you


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